Changeset 0b1b52d in opengl-game for graphics-pipeline_opengl.cpp

Timestamp:

Oct 4, 2019, 8:27:07 PM (5 years ago)

Author:

Dmitry Portnoy <dmitry.portnoy@…>

Branches:

feature/imgui-sdl, master, points-test

Children:

771b33a

Parents:

83b5b4b

Message:

In openglgame, port over the functionality to specify and initialize varying attributes

File:

• graphics-pipeline_opengl.cpp (modified) (2 diffs)

graphics-pipeline_opengl.cpp

@@ -6 +6 @@
 using namespace std;
 
-GraphicsPipeline_OpenGL::GraphicsPipeline_OpenGL() {
+GraphicsPipeline_OpenGL::GraphicsPipeline_OpenGL(Viewport viewport) {
+   this->viewport = viewport;
 }
 
@@ -12 +13 @@
 }
 
+void GraphicsPipeline_OpenGL::addVaryingAttribute(VaryingAttribType attribType, GLint size, GLenum type,
+      size_t fieldOffset) {
+   // TODO: Throw an exception instead
+   if (type != GL_FLOAT && type != GL_UNSIGNED_INT) {
+      cout << "Unknown shader program attribute type: " << type << endl;
+      return;
+   }
+
+   VaryingAttribInfo attributeDesc;
+
+   attributeDesc.attribType = attribType;
+   attributeDesc.index = this->varyingAttribs.size();
+   attributeDesc.size = size;
+   attributeDesc.type = type;
+   attributeDesc.fieldOffset = fieldOffset;
+
+   this->varyingAttribs.push_back(attributeDesc);
+}
+
 void GraphicsPipeline_OpenGL::createPipeline(string vertShaderFile, string fragShaderFile) {
    shaderProgram = loadShaderProgram(vertShaderFile, fragShaderFile);
 
-   glGenVertexArrays(1, &vao);
-   numPoints = 0;
+   this->numPoints = 0;
+   glGenVertexArrays(1, &this->vao);
+   glBindVertexArray(this->vao);
+
+   vector<VaryingAttribInfo>::iterator it;
+   for (it = this->varyingAttribs.begin(); it != this->varyingAttribs.end(); it++) {
+      glEnableVertexAttribArray(it->index);
+
+      glGenBuffers(1, &it->buffer);
+      glBindBuffer(GL_ARRAY_BUFFER, it->buffer);
+
+      switch (it->type) {
+         case GL_FLOAT: {
+            glVertexAttribPointer(it->index, it->size, it->type, GL_FALSE, 0, NULL);
+            break;
+         }
+         case GL_UNSIGNED_INT: {
+            glVertexAttribIPointer(it->index, it->size, it->type, 0, NULL);
+            break;
+         }
+      }
+   }
 }